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Usually mitigation for all my dumb questions: I will endeavour to make sure I explain everything I find out on www.substitutereality.co.uk so that other newbies like me have a useful resource to check first...

You should try a couple of NUUK's SMPS, I've built several different PSU's for my GC's and Amp3, to my ears the SMPS was my favourite
Its worth adding around a 10,000uf cap on the output, this works quite well
They are a good price too!

Originally posted by jackinnj you can buy a 48V switching supply -- always for sale on EBay -- then configure the GC as single-supply as National Semi describes. The performance isn't much different vis a vis a bipolar supply.

I guess that if someone thought that they had to have dual supplies, they could always split the 48v into +/-24v, using another chipamp to make a power supply "splitter", with a circuit something like what is shown in the LM675 datasheet (The LM675 is almost identical to the LM1875. But something very similar should work with almost any amp chip.).

From Manual, page 8:4.1 Series Operation
- You can use a power supply in series operation. The output current
in series operation should be lower than the rated current of a
power supply with the lowest rated current among power supplies
that are serially connected. Please make sure that no current exceeding the rated current flows into a power supply.